Method of condensing gasoline vapors



June 9, 1931- Fyw. lsLEs METHD 0F CONDENSING GSOLINE VAPORS Filed Jan. 25, 1927 Flmszmcx w: IsLEs.

Patented June 9, 1931 UNITED STATES;

FREDERICK w. isLEs, E BAYONNE, NEW aERsE-Y, AssIGNonTo sTANDAED OIL v DEVELOPMENT COMPANY, A CORPORATION 0E DELAWAREy METHOD or CoNDENsING CAS-CLINE" vAPoRs Application led January 25, 1927.

This invention relates to improvements in the recovery of low-boiling petroleum oils from gases and/or vapors containing the same. The invention is .based on the addi'fl Y D tion of benzol or equivalent material to a gas or vapor stream containing such lowboiling oils.

The invention will be fully understood from the iollowing description, read in con-l nection with the accompanyingk drawing, in which the single'figure is a diagrammatic side elevation of a stripping still and condensing equipment. y

Referring yto the drawing, reference numeral 1 denotes a stripping still having a Y vapor line 2 leading to a tower 3, which may have bell capsy Or other baffle means. The still 1 is charged with an oil containing absorbed'low-boiling petroleum constituents. This oil may be the absorption stock obtained from a refinery gasoline recovery plant. The low-boiling vconstituents (gases, light gasoline, etc.) are expelled by heating the absorption stock in still 1 and pass through thev fractionating tower 3 and a vapor line 4 inthe usual manner. )The oil from which the absorbed constituents have been removed may be continuouslyv or .peri- Odically withdrawnkby means of the outlet pe 13. y

The distilled vapors pass from vapor line 4 into a header 5 and are showered with av low-boiling hydrocarbon solvent, especially benzol, issuing from perforations 6 in a pipe 7 arranged longitudinally in the header.

Thefbenzol and still vapors pass together through cooling coils 8, wherein vapors are condensed. These coils may be immersed in a tank 9 supplied vwith cooling water, or they may be otherwise suitably cooled. The product is drawn ofi' through line 10 to an accumulator 11 which has a vent line 12, for incondensible gases.

The yield of gasoline constituents is usun ally increased by 30% ormore, as compared still. Enoughbenzol 'shouldf be supplied to -gas coolers of compression gasolineplants,

isjmy intention to claim all novelty inherent*y Serial No. 163,329.

vwith that obtained by simple condensation, when the solvent or absorbent oil'is used; as described. The. benzol blends produced-are well adapted-for mixing with'heavy naph thato produce motor gasoline of high qual-150 ity.v 7. v,. l i The" amount of benzol required"k Iwill vvary with the composition' of the vapors from,v the absorb, dissolve,or otherwise' ixysubstan-V ized? in the header-will, of course, be con# densed 'in contact with petroleum vapors as it passesY with them through the cooling coils 8f f Y Y 1 f Instead of benzol, Imayj-use an equiva., lent, `for example, a naphtha fraction having an average boiling temperature not materially diii'erent from E). The initial and final boiling'points of the naphtha fraction may be respectively about 169 F. and 338 F. I have found that such relatively low-boiling liquids are highly pors and give much better results than Vkerosene or heavier oils. l.

- The method described is not limited to the recovery of vapors from absorption stock. It may be used also with advantage in char- 75 coal absorption plants for the recovery lot gasoline from natural gas. In this case the benz/.ol or theV like will be brought into con-v tact with the vapors expelled from the saturated charcoal., Similarly, gasoline yields ,8O are increased byV practicing the methody in connection with condensers forthepre-com- Y pressed residue gases obtained at natural gas gasoline recovery plants, in the compressed and the like.

Various Amodiiications of 'the preferred method described may be made within the scope of the appended claims, in which it 5i tially all-the gasoline vapors;y It'is'ibest in= troduced'in liquid form. Anybenzol vapor` A that of kbenzol (1760135 eiiicient absorbents for gasoline vain the invention as broadly as the prior art permits.

I claim: l. In a method of recovering low-boiling 5 volatilized petroleum oils, of the type of light gasoline, the improvement that comprises bringing such oils into intimate contact with a solvent therefor having an Y average boiling temperature not materially different from thatof benzol, cooling, and collecting condensed low-boiling petroleum oils and solvent.

2. In a method of recovering low-boiling volatilized petroleum oils, of the type of light gasoline, the improvement that comprises supplying streams of benzol to mingle with such volatilized oils, condensing the oils yin contact with the benzol, and recovering the condensed product.` 3. Method of recovering light gasoline vapors, comprising distilling such vapors from a solvent oil containing the same, bringing benzol into intimate contact with the stream of distilled vapors, passing the benzol and vapors together through a condensing zone, and collecting the condensate. `4. lMethod of condensing light petroleum vapors mixed with incondensible gas, said method comprising cooling said vapors to a condensing temperature in the presence of benzol whereby a benzol-petroleum blend is formed and the said vapors are substantially completely removed from the incondensible gas, collecting the blend, and withdrawing as gas Y In testimony that I claim the foregoing as my invention, I affix my signature. FREDERICK W. ISLES.

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